//package leetcode;
//
//import java.util.HashMap;
//import java.util.Map;
//
//class Solution {
//    public boolean isNumber(String s) {
//        Map<State, Map<CharType, State>> transfer = new HashMap<State, Map<CharType, State>>();
//        Map<CharType, State> initialMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_SPACE, State.STATE_INITIAL);
//            put(CharType.CHAR_NUMBER, State.STATE_INTEGER);
//            put(CharType.CHAR_POINT, State.STATE_POINT_WITHOUT_INT);
//            put(CharType.CHAR_SIGN, State.STATE_INT_SIGN);
//        }};
//        transfer.put(State.STATE_INITIAL, initialMap);
//        Map<CharType, State> intSignMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_NUMBER, State.STATE_INTEGER);
//            put(CharType.CHAR_POINT, State.STATE_POINT_WITHOUT_INT);
//        }};
//        transfer.put(State.STATE_INT_SIGN, intSignMap);
//        Map<CharType, State> integerMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_NUMBER, State.STATE_INTEGER);
//            put(CharType.CHAR_EXP, State.STATE_EXP);
//            put(CharType.CHAR_POINT, State.STATE_POINT);
//            put(CharType.CHAR_SPACE, State.STATE_END);
//        }};
//        transfer.put(State.STATE_INTEGER, integerMap);
//        Map<CharType, State> pointMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_NUMBER, State.STATE_FRACTION);
//            put(CharType.CHAR_EXP, State.STATE_EXP);
//            put(CharType.CHAR_SPACE, State.STATE_END);
//        }};
//        transfer.put(State.STATE_POINT, pointMap);
//        Map<CharType, State> pointWithoutIntMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_NUMBER, State.STATE_FRACTION);
//        }};
//        transfer.put(State.STATE_POINT_WITHOUT_INT, pointWithoutIntMap);
//        Map<CharType, State> fractionMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_NUMBER, State.STATE_FRACTION);
//            put(CharType.CHAR_EXP, State.STATE_EXP);
//            put(CharType.CHAR_SPACE, State.STATE_END);
//        }};
//        transfer.put(State.STATE_FRACTION, fractionMap);
//        Map<CharType, State> expMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_NUMBER, State.STATE_EXP_NUMBER);
//            put(CharType.CHAR_SIGN, State.STATE_EXP_SIGN);
//        }};
//        transfer.put(State.STATE_EXP, expMap);
//        Map<CharType, State> expSignMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_NUMBER, State.STATE_EXP_NUMBER);
//        }};
//        transfer.put(State.STATE_EXP_SIGN, expSignMap);
//        Map<CharType, State> expNumberMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_NUMBER, State.STATE_EXP_NUMBER);
//            put(CharType.CHAR_SPACE, State.STATE_END);
//        }};
//        transfer.put(State.STATE_EXP_NUMBER, expNumberMap);
//        Map<CharType, State> endMap = new HashMap<CharType, State>() {{
//            put(CharType.CHAR_SPACE, State.STATE_END);
//        }};
//        transfer.put(State.STATE_END, endMap);
//
//        int length = s.length();
//        State state = State.STATE_INITIAL;
//
//        for (int i = 0; i < length; i++) {
//            CharType type = toCharType(s.charAt(i));
//            if (!transfer.get(state).containsKey(type)) {
//                return false;
//            } else {
//                state = transfer.get(state).get(type);
//            }
//        }
//        return state == State.STATE_INTEGER || state == State.STATE_POINT || state == State.STATE_FRACTION || state == State.STATE_EXP_NUMBER || state == State.STATE_END;
//    }
//
//    public CharType toCharType(char ch) {
//        if (ch >= '0' && ch <= '9') {
//            return CharType.CHAR_NUMBER;
//        } else if (ch == 'e' || ch == 'E') {
//            return CharType.CHAR_EXP;
//        } else if (ch == '.') {
//            return CharType.CHAR_POINT;
//        } else if (ch == '+' || ch == '-') {
//            return CharType.CHAR_SIGN;
//        } else if (ch == ' ') {
//            return CharType.CHAR_SPACE;
//        } else {
//            return CharType.CHAR_ILLEGAL;
//        }
//    }
//
//    enum State {
//        STATE_INITIAL,
//        STATE_INT_SIGN,
//        STATE_INTEGER,
//        STATE_POINT,
//        STATE_POINT_WITHOUT_INT,
//        STATE_FRACTION,
//        STATE_EXP,
//        STATE_EXP_SIGN,
//        STATE_EXP_NUMBER,
//        STATE_END
//    }
//
//    enum CharType {
//        CHAR_NUMBER,
//        CHAR_EXP,
//        CHAR_POINT,
//        CHAR_SIGN,
//        CHAR_SPACE,
//        CHAR_ILLEGAL
//    }
//}
//
//public class Test1S {
//}
